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PARKLAND, FL (ABC NEWS) - A gunman opened fire at a Southern Florida high school today, killing at least 17 people and sending students running for their lives, according to two law enforcement officers on the scene.

-- At least 14 victims were taken to hospitals from the incident at Stoneman Douglas High School in Parkland, the Broward Sheriff's Office said, though their conditions were not immediately clear.

-- The suspect was taken into custody off campus but the scene is still active as SWAT teams clear the school, the sheriff's office said.

-- The suspect slipped out of the school after the shooting by blending in with other students who were trying to escape, according to two law enforcement sources and an eyewitness.

-- The suspect's name is Nicolas Cruz, according to multiple law enforcement sources.

-- The sheriff said Cruz is believed to be about 18 years old and is not a current student. He had attended the school but it is not clear when he left, the sheriff's office said.

-- Students were seen sprinting out of the school with their hands up as authorities with guns drawn swarmed the area. Other students were seen lined up one by one, leaving the area in an orderly fashion. Some students were hysterical, reported ABC affiliate WPLG.

Student Michael Katz told ABC News that at the end of the day he "heard what sounded like a garbage truck like banging."

"We had police invade the school, and we were taken out," Katz said. "Fortunately, my father was there to pick me up."

Worried parents wait for students amid shooting situation at South Florida high school Student says he saw two apparently dead bodies outside his classroom door There have already been 18 school shootings in the US this year: Group One mother shaking with worry told WPLG her daughter said she was OK, huddled in a locked classroom.

"She's terrified," the mother said. "I'm glad that she's able to text."

Freshman student Samuel Dykes told the Orlando Sentinel that he was on the third floor of the school when he heard gunshots.

Officers told students to look forward as they evacuated, but Dykes told the newspaper that he saw several bodies in a classroom.

Broward County Sheriff Scott Israel called it a "horrific homicidal act."

There are over 3,000 students at the school, according to its website.

President Donald Trump tweeted, "My prayers and condolences to the families of the victims of the terrible Florida shooting. No child, teacher or anyone else should ever feel unsafe in an American school."

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